The ProMicro uses an Atmega 32U4 microprocessor which is essential for it to appear to a PC as a keyboard or a mouse.
The Nano uses an Atmega 328 and does not have that capability.
...R
The ProMicro uses an Atmega 32U4 microprocessor which is essential for it to appear to a PC as a keyboard or a mouse.
The Nano uses an Atmega 328 and does not have that capability.
...R